Sn_Cu_Ni焊点纳米压痕试验分析(2)

nanocrystallineZnO［J］．JournalofMaterialsResearch，1992，7（4）：973－979．

［4］GaoF，NishikawaH，TakemotoT，etal．Mechanicalproperties

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［5］ChromikRR，VinciRP，AllenSL，etal．Measuringtheme-chanicalpropertiesofPb-freesolderandSn-basedintermetallicsJ］．JournaloftheMinerals，MetalsandMate-bynanoindentation［

2003，55（6）：66－69．rialsSociety，

［6］DudekMA，ChawlaN．Nanoindentationofrareearth-Sninterme-

图6Fig.6

钎料基体蠕变应变速率—压痕硬度关系图

tallicsinPb-freesolders［J］．Intermetallics，2010，18（5）：1016－1020．

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［8］王凤江，钱乙余，马

775－779．

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Ag-Cu无铅钎鑫．纳米压痕法测量Sn-．金属学报，2005，41（7）：料BGA焊点的力学性能参数［J］

Relationofcreepstrainrateandhardnessofsold-eralloy

Sn-Pb钎料是由富锡相+富铅相构成的固溶

Cu-Ni钎料的显微组织是由富锡相+金属体，而Sn-细小的金属间化合物颗粒硬度较高，间化合物构成，

弥散分布于钎料中，能够阻碍位错的滑移，使得抗蠕

变性能有较大的提高．但粗大的金属间化合物由于力学性能参量与钎料基体有较大的差异，因此对整个焊点的力学性能将起到负面作用．

微量Ce元素可聚集在表面、界面处，有效降低界面能，阻碍晶界滑动，因此对焊点抗蠕变性能具有显著改善作用，试验结果表明添加Ce元素可有效

作者简介：

@126．com

1981年出生，王俭辛，男，博士，讲师．主要研究方向

为无铅钎料及微电子焊接技术．发表论文10篇．Email：wangjx_just

Ⅳ

MAINTOPICS，ABSTRACTS＆KEYWORDS2011，Vol．32，No．12

Throughcomparingthesimulationresultsandexperimentalmeas-urements，thepredictionaccuracyofthedevelopedthermo-elas-tic-plasticFEMbasedonQuickWelderwasverified．Mean-while，theinfluenceofweldingsequenceontheresidualstress

distributionwasclarifiedusingnumericalsimulationmethod．Theresultsshowthatbothtransverseresidualstressandlongitudinalresidualstressweresignificantlyaffectedbydepositionsequence．Thedepositionsequencenotonlylargelychangesthepeakvaluesofresidualstress，butalsoalterstheshapeofresidualstressdis-tribution．

Keywords：numericalsimulation；non-linearanalysis；weldingresidualstress；weldingsequence

NanoindentationmeasurementofSn-Cu-NijointWANG

Jianxin，LAIZhongmin，SUNDandan（ProvinceKeyLabofAd-vancedWeldingTechnology，JiangsuUniversityofScienceandTechnology，Zhenjiang212003，China）．p59－62

Abstract：Inordertostudytheeffectofintermetalliccompoundonmechanicalpropertiesofjoint，theelasticmodulusandhardnessofintermetalliccompoundswereanalyzedbynanoindentationmethod，andthecreepstrainratesensitivityofsoldermatrixwasobtainedbyMayo-Nixmethod．Fromthephysi-calanalysisofnanoindentationcurves，theelasticmoduluof（Cu，Ni）6Sn5inSn-Cu-Nijointsis113．2GPa±4．8GPa，

whilethehardnessis5．59GPa±0．32GPa．Itisfoundthatin-termetalliccompoundsarethekeyfactorsinthereliabilityoflead-freejoints，duetothebigcontrastsbetweenmechanicalpropertiesofintermetalliccompoundsandsoldermatrix．ThecreepstrainratesensitivitiesofSn-Cu-Ni，Sn-Cu-Ni-0．05Ceand

Sn-Pbsoldermatrixare0．1286，0．1248，and0．1832，andthecreepstressexponentsare7．7760，8．0128，and5．4585，re-spectively，whichindicatetheimprovementincreepresistanceofSn-Cu-NijointsduetoCeaddition．Keywords：lead-freesolder；nanoindentation；elasticmodulu；creepstrainratesensitivity

InterfacialmicrostructureofsinteringcompositesofPCBN

ZHANGBin，grains-graphiteparticles-CuSnTialloy

DINGWenfeng，XUJiuhua，CHENZhenzhen，SUHonghua，FUYucan（CollegeofMechanicalandElectricalEngineering，NanjingUniversityofAeronauticsandAstronautics，Nanjing

69210016，China）．p63－65，

Abstract：SinteringexperimentsofCu-Sn-Tialloy，poly-crystallinecubicboronnitride（PCBN）abrasivegrainsandgraphiteparticleswerecarriedoutattheheatingtemperatureof920℃withthedwelltimeof30min．Thestrengthofsinteringbulkswasmeasuredbymeansofthethree-pointbendingexperi-ments．Theinterfacialmicrostructureandthephasesofthesinte-ringbulkswerecharacterizedusingscanningelectronmicroscope（SEM），energydispersionspectrometer（EDS）andX-raydif-fraction（XRD）．Theresultsrevealthatinthecaseofthegraph-itecontentof5～15wt%，thebendingstrengthofthecompositebulksisabove91MPa，whichismuchhigherthanthatofthebulkstrengthofthevitrifiedgrindingwheels．Theelementaldif-fusionbehaviorhastakenplaceacrossthejoininginterfacebe-tweenPCBNgrainsandCu-Sn-Tialloyinthesinteringprocess．

Thecompoundswereformed，therefore，thePCBNgrainswerebondedfirmly．Undersuchcondition，thebreakageofthePCBNgrainshasplayedthemostimportantroleinthefractureofthecompositebulks．Inparticular，thebreakagemodeofthePCBN

grainsistheintergranularfracture．

Keywords：PCBNabrasivegrains；Cu-Sn-Tialloy；ben-dingstrength；interfacialmicrostructure

Finiteelementanalysisoftemperaturefieldduringkeyhole-plasmaarcweldingusingSYSWELDsoftwareHU

112

Qingxian，WANGYanhui，YAOQingjun，WANGShunyao1（1．ProvincialKeyLabofAdvancedWeldingTechnology，Jian-gsuUniversityofScienceandTechnology，Zhenjiang212003，China；2．JiangsuProvinceSpecialEquipmentSafetySupervi-sionInspectionInstitute，YangzhouBranch，Yangzhou225003，China）．p66－69

Abstract：Consideringtheweldgeometriccharactersofkeyholeplasmaarcwelding（K-PAW），asuitableandadaptive

combinedheatsourcefornumericalsimulationisdeveloped，i．e．atthetransversecross-sectionandalongtheworkpiecethick-ellipsoidalvolumetricheatsourceactsnessdirection，thedouble-atupperpartoftheworkpiecewhilealinearly-increasedpeak

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